Induction-coil.



J. E. GAVANAGH.

INDUCTION COIL. 7

APPLICATION FILED APR. 19, 1909.

1,034,583. P en ed Augs, 1912.

Fig.1.

WITNESSES INVENTOH F 1 John Fcavancyh ((LQQS I BY A TTORIYE Y UNITED'stm'rns PATENT oFFrcE.

JOHN GA'VZA NAGH, OF PROVIDENCE, RHODE ISLAND, LSSIG-NOR 'THREE-FOUBTHS'1'0 LIN-DSLEY & ALLEN ELECTRIC COMPANY, OF PROVIDENCE, mom: ISLAND, A.

CORPORATION G1! RHODE ISLAND.

INDUCTION -COI'L.

Specification of Letters Patent.

Patented Aug. 6, 1912.

Application filed April '19, 1909. Serial No. 490,721..

invented certain new and useful Improve ments in Induction-Coils, ofwhichthe following is a specification, reference being had therein tothe accompanying drawing.

This invention relates to improvements in induction coils adapted foruse in the electric igniting circuit of hydrocarbon or explosionengines, and has for its object to provide acasing for a coil that iscompletely inclosed and self-contained, being both water and air tightand efi'ectually protected fromg a vibrator having an armature supportedfrom one end is necessarily obliged to work injury.

A further ob ect of the invention is to provide an improved currentinterru ting vibrator of simple, practical and e cient construction, andalso to increase the effectiveness of the magnetic field andconsequently the electro-motive force of the coil by controlling to someextent the path of travel of the linesof force in circulating throughthe coil.

In the construction of induction coils having a secondary winding it isfound of great importance to radiate or draw the lines of force outwardfrom the center of the core at the poles a distance sufiicientto causethe greatest number to pass through the secondary winding in completingtheir magnetic circuit. In order to accomplish this result I employ twoconcentric soft iron rings set in the insulating head of the coil case,which rings have the effect of drawing out, spreading, or radiating thelines of force from whence they will naturally pass through thesecondary winding, thus greatly increasing the efliciency of the coil.These concentric iron rings serve a double purpose, in addition to theiracting upon the lines of force the inner ring performs the function ofthe ordinary vibrator block, as it serves to support my spirally formeddisk-like resilient vibrator all around its outer edge and directly overthe center of the core. The outer ring, which is insulated from theinner ring, performs the function of the usual bridge as it supports acap member through the center of which is the usual adjustable platinumpointed contact screw, by which construction it will be seen that thiscap in addition to serving as .a bridge for supporting the adjustingscrew, also completely 1ncases or incloses the vibrator and also thecontact points in substantially an air-tight and water-tight chamber,thus protecting said ;points from the deteriorating efi'ect of moisture,dust and injurious gases.

As my improved vibrator is made in a disk form it also serves inaddition to acting as a vibrator to assist the lines of magnetic forceto pass through the secondary wind mg.

It is found in practice that the ordinary on the arc of a circle andtherefore the surface of the points are thrown out of line with eachother when the screw is being adjusted, thus causing sparking and unduewear. I have completely obviated this difficulty by making my vibratorin a spiral rform, whereby the contact point which is set at the apex ofthe spiral is ca-used'to move in a direct line with the .axis of thecontact screw, thus removing all possibility of the surfaces of thepoints getting out of alinement one with the other.

With these and other objects in view, the invention consists of certainnovel features of construction, as will be more fully described andparticularly pointed out in the appended claims.

In the accompanying drawings: Figure 1 is a perspective viewillustrating the general shape and construction of my improved inductioncoil. Fig. 2- is the same artly in section. 3- .is a plan View of myspirally formed vibratory disk. F g. 41- is an enlarged view illustratinthe upper end of the core and showing t e armature, a portion of thevibrator disk and the inclosingcap in section supporting .the contactpoints. Fig. 5- is a diagrammat c view illustrating the winding of theC011 and the connection of said winding to a spark plug. Fig. 6 is aperspective view of the frictional thimble containing the contactregulating screw.

Referring to the drawings 1 designates a casing preferably square incross sect1on and constructed of a block of wood or other suitablematerial having a central bore nearly through.the same leaving a bottomportion 2 integral therewith and into which bore is set the core 3around which is arranged the primary coil 4, secondary COIlS 5-5 andcondenser .6. The terminals for the primary coil are connected tosockets 7 and 8 while the terminals for the secondary coil are connectedat 9 and 10. The space around the coils is then packed with a suitablefilling and an insulated head. 11 is secured in the upper end of theblock hermetically sealing the contents, the upper end of core 3 beingarranged to extend through said head a short distance. Encircling theupper end of this core and molded into the head 11 are two concentricsoft iron rings 12 and 13 insulated from each other by the ring 14 whichis set between them, said ring 12 beingconnected to the primary coil andring 13 to the condenser by wires 36 and 37, respectively. The innerring 12 is a little narrower and its upper edge is slightly below thatof the outer ring 13, which edge serves as a continuous bearing for thevibrator disk 15 hereinafter described. The outer face of the outer ringis preferably threaded to receive the correspondin'gly threaded anddownwardly turned edge 17 of the cap 16, said cap also being provided onits inner edge with an insulating ring 18 adapted to set down hard ontothe vibrator disk and bind its .outer edge firmly against its bearingring 12. The center portion of this cap is raised and thickened at 19forming a boss which is provided with a tapped hole to receive theregulating screw 20, said screw being knurled on its outer edge andprovided with an enlarged head 21 projecting downwardly from which is athin annular ring or skirt 22 adapted to fit closely around the boss,19and be sprung out of a true circular form to flexibly engage said bossand retain the screw by friction when set in position. The inner end ofthis screw is provided with a platinum or iridium point 23 which comesin contact with the corresponding point at the end of the spiral springof the vibrator 15. This vibrator is formed of a thin disk through whichis cut a spiral finger 27 gradually tapering in cross section from itsstarting point 28toward the center or end 25 thereof, thereby forming anexceptionally long and flexible spring whose center is adapted to movein and out on a line parallel with the axis of the core at which centeris mounted an iridium or platinum contact point 29.

An armature. 30-, see Fig. 4, is riveted at 31 a short distance backfrom the end of The operation of my improved induction coil may be morefully described as follows: The current derived from the battery 32passes through the wire 33, primary coil 4, inner ring 12 by wire 36through the vibrator 15, points 23 and 29 back across the cap 16 to theoutside ring 13 through wires 37 and 34 back to the source 32, thecondenser 6 performing its usual function which is that of reducing thetendency to are. The electric current passing through the primarywinding magnetizes the core and this magnetism attracts the vibratorarmature 30, which. by the flexure of its spring is allowed to move fromits opposite contact point toward the core thus separating said contactpoints, opening and interrupting the circuit, when the electric currentthus broken ceases to flow and the core loses its magnetism, thearmature then ceases to be attracted and at once returns by the tensionof its spring to its first or contact position, again completing thecircuit. The foregoing cycle is continuously repeated as long aseffective current is supplied to the coil. This making and breaking ofthe primary current and core magnetism, induces a high tension currentin the secondary, which is led by the circuit through wire 38 to thespark plug 35, producing av powerful spark for igniting the engine fueland driving its piston by the explosion of the same.

An essential and practical feature of my improved construction is thatboth of the contact points may be readily removed from the casing forinspection or repair by simply removing the cap and dropping out thevibrator disk without changing the adjustment of either of the points.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. An induction coil comprising a magnet core, primary and secondarywindings, a conducting member, an independent and removable interruptermember resting on said.

a contact-carrying cap covering and binding said interrupter to saidring.

3. An induction coil comprising a primary and secondary coil with acondenser, a removable interrupter member having a continuous marginalportion and cut within its margin to provide a flexible centralresilient tongue movable in line with its axis torthe purpose ofinterrupting the primary circuit, and means for securing the entiremarginal portion in fixed position.

4. An induction coil comprising a primary and a secondary coil, aninterrupter constructed of a thin sheet metal disk having a continuousouter portion and provided with a spirally formed aperture through itwhereby a flexible vibratory member is formed integral with the outerportion of said disk.

5. An induction coil comprising a primary and a secondary coil, and aninterrupter comprising a ring having a spirally shaped flexible memberintegral therewith.

6. An induction coil, comprising a core, a primary and a secondary coil,an interrupter comprising a ring havin a flexible spiral vibratorymember integra? therewith, and a ring about said core on which theperiphery of said interrupter ring is supported, substantially asdescribed.

7. An induction coil comprising a core, a primary and a secondary coil,an interrupter comprising a circular ring having a flexible spiralvibratory member integral therewith, an armature on one side of saidmember and a contact point on the opposite side of said member near itsapex, and means around said core for supporting said ring and flexiblemember.

8. In an induction coil, a core, a primary and a secondary winding, acondenser, a magnetic interrupter, and a concentric ring of magneticmaterial supporting and in magnetic contact with said interrupter forthe purpose of increasing the attraction between said core and saidinterrupter.

9. An induction coil comprising a primary and a secondary coil, aninterrupter constructed in the form of a resilient vibratory tongue, andrings arranged to support and work in conjunction with said interrupterfor influencing the lines of force and controlling their path of travelin circulating through the coil.

10. An induction coil comprising a core, a primary and a secondary coil,an interrupter constructed of a flexible spiral spring and one or moreiron rings about said core for influencing the lines of force andcontrolling their path of travel in circulating through the coil.

11. An induction coil comprising a core, a primary and a secondary coil,an interrupter constructed of a flat metal ring-having a flexible spiralspring formed integral therewith, an armature and a contact point fixednear the apex of said spiral spring, a metal ring about one end of saidcore, said ring being adapted to support said interrupter, and a. capforinclosing the same.

12. An induction coil comprising a core,

a primary and a secondary coil, an inter rupter constructed of a flatmetal ring haw ing a flexible spiral spring formed integral therewith,an armature and a contact point fixednear the apex of said spiralspring, a plurality of metal rings about one end of said core, saidinterrupter being supported around its outer edge on one of said metalrings, a cap supported from one of said metal rings adapted to tightlyinclose the operating parts, and an adjustable contact screw threadedthrough said cap.

13. An induct-ion coil comprising a core, a primary and a secondarycoil, an interrupter, a metal ring about one end of said core, saidinterrupter being supported on said ring, a cap of conducting materialinclosing the operating parts, an adjustable contact screw threadedthrough said cap, and means for firmly retaining said screw.

14. An induction coil comprising a core, a primary and a secondary coil,an interrupter constructed in the form of a resilient spiral member, twoconcentric rings insulated from each other about one end of said core,said interrupter being firmly supported on the inner ring a cap forminga bridge member and also serving to tightly inclose the interrupter andthe contact points, said cap being supported on the outer ring, and anadjustable contact screw threaded through said cap.

15. An induction coil, comprising a casing constructed of a block havinga circular bore the bottom portion of said block being integraltherewith, a core, primary and secondary coils and a condenser locatedin said bore, the mouth of said bore being closed and sealed with asingle insulatinghead, a vibrator and contact points operatively mountedon the outside of said head, and a removable-cap also mounted on saidhead for inclosing said vibrator and the contact points.

16. An induction coil comprising a primary and secondary coil with acondenser and an interrupter, means around the core for deflecting thelines of force, a cap inclosing said interrupter, an adjustable contactscrew threaded through said cap, and means connected to said screw forretaining the same by friction.

17. In an induction coll, a tapped hub, a

vibrator controlling screw adjustably mounted on said hub, said screwbeing provided with an enlarged head, a skirt portion connected to saidhead and extending 10 skirt portion being of thin metal and adapted tobe bent out of a true circular form whereby said skirt is adapted toengage the periphery of said hub and retain said screw therein byfriction.

In testimony whereof I affix my signature s inpresence of two witnesses.

JOHN F. CAVANAGH.

Witnesses:

HOWARD E. BARLoW, E. I. OGDEN.

